Electric-circuit breaker



March as, 1926. 1,578,018

C. ELEMAN ELECTRIC CIRCUIT BREAKER Filed April 28, 1923 Z lNVEN TOR BY W AT'TOBNE Patented Mar. 23, 1926.

UNITED STATES CHARLES ELEMAN, OF CHICAGO, ILLINOIS.

ELECTRIC-CIRCUIT BREAKER.

Application filed April 28, 1923. Serial No. 635,218.

T 0 all whom it may concern Be it known that I, CI-IARLns ELEMAN, a citizen of the United States, residing at Chicage, in the county of Cook and State of Illinois, have invented new and useful Improvements in Electric-Circuit Breakers,--of which the following is a specification.

This invention relates generally to circuit breakers or fuses and has particular reference to renewable fuses.

Among the objects of the invention is the provision of a fuse plug having a renewable fuse so that comparatively, great economy is attained by this invention by the saving or retainment of the fuse plugs which heretofore were destroyed with the fuse.

lVith the above and other objects in view my invention consists in the novel construction and combination of the parts and members shown in the accompanying drawings, described in the following specifications, and particularly pointed out in the appended claim.

Referring to the drawings :Figure 1 is an elevation of a fuse plug embodying my invention; Figure 2, is a vertical section of the plug, and Fig. 3, a vertical cross section of the fuse. Figure 4 is a cross section taken on line 4c 1 of Fig. 2, showing the connection of the contact ring with the metallic thread.

Referring to the drawing, which shows one embodiment of my invention, 10 inclicates a fuse plug of any electrically non= conducting material such as porcelain.

lhe body 10 is preferably made with an enlarged upper or head end 10 for convenience in handling and is formed with a longitudinal passage 12 through the entire length of the body. The passage 12 is slightly enlarged at 1.2 within the upper part of the body 10 to provide room for the enlarged head 13 of the fuse 13. The passage 12 is again further enlarged at 12 within the head end 10 to provide for the retainer 11 having a thread stem 11 mount ed therein.

The fuse 13 is provided with an interior longitudinal passage 13 having a fuse wire 13 extending between and connecting the and metallic caps 13 and 13 The body 10 is threaded and covered with a metallic thread sleeve 14: to fit into a standard fuse socket.

lVithin the bottom of the enlarged passage 12 is acontact ring 15 having integral strips 15 extending through the body of the plug and having fixed welded or soldered connection with the metallic threaded sleeve 14, or the strips 15 may be extended to pass on the inner side of the sleeve 1 1 for frictional engagement between the same and the body 10 The bottom of the stem 11 is provided with a metallic washer 16 and screw 17 of conductive material. A spring 18 is interposed between the washer 16 and ring 15 to provide a yieldable conductive connection from the threaded sleeve 14 to the fuse cap 13 through the screw 17 which contacts with it.

From the above the circuit can be readily progressively traced through the threaded sleeve 14, strips 15 ring 15, coil spring 18, washer 16, screw 17, fuse cap 13, fuse wire 13 and protruding fuse cap 13 It is obvious, that in the burning of the fuse wire 13 the circuit will be broken and that upon the renewal of the fuse 13, the circuit can again be restablished. It will be observed now that through this invention only the small inexpensive fuse 13 is necessarily renewed and that the remaining part of the plug will last indefinitely.

I claim:

In a fuse plug having a body for connection to a socket in an electric circuit, a threaded electrically-conductive exterior sleeve, 21 removably mounted fuse, a screw mounted cap member having a contact with said fuse, an annular conductive member mounted within the plug and having connection with said sleeve through a pair of oppositely disposed strips extending through the body of the plug, and a coil spring conductively connecting said annular member with said cap member.

In witness whereof I afiix my signature.

CHARLES ELEMAN. 

